Screw-fastening device.



W. H. BRISTOL.

sGREW EASTENING DEVICE.

APPLIUATION FILED MAR.10, 1914.

1106,342 Patented Aug. 4, 1914.

siriane ra'rnnr WILLIAM H. ,BRISTOL, 0F WATERBURY, CONNECTICUT, ASSIGNOR TO THE BRISTOL COMPANY, OF WATERBURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SCREW-FASTENING DEVICE.

Specification of Letters Patent.

Patented Aug. 4:, 1914i.

Application led March 10, 1914. Serial No. 823,671.

To all whom t may concern:

`of the nature of a bolt or the like and nut adapted to coact therewith.` 4

It has for its object to enable the nut to be more quickly drawn against an abutment or object to be held than has heretofore been the case, in that the screwing on of the said nut throughout the entire projecting threaded portion of the bolt is rendered unnecessar rlyhe nature of the invention will be bestanderstood when described in connection with the accompanying drawings, in which Figure l illustrates in vertical section one embodiment of the improved fastening means. Fig. 2 is an underneath view of the nut shown 'in Fig.v1. Fig. 3 is a vertical section illustrating the invention as employed in the retaining of a record chart of recording gages and the like.

Similar characters of reference designate corresponding parts throughout the several views.

Referring to the drawings, 10 designates a stud which is shown inserted in place to hold a plate 11 or the like and provided with threads of usual and standard design. This articular portion of the fastening device, he it stud, bolt or other threaded lmember adapted to receive a nut or the like, is generally'in no wise changed .from those commonly employed for similar purposes. The nut 12, however, which is adapted to fit over the projecting and threaded portion has its threads extending but partly around its interior, affording thereby a larger internal diameter than would be required ordinarily for the corresponding bolt. The said greater diameter may be obtained, for example, by reboring the nut eccentrically aff ter the same has been tapped as for ordinary purposes. This, of course,` removes a certain portion of the thread of the nut so that merely a portion 13 of the original thread remains. said nut being thus 'somewhat greater than The internal diameter ofthe diameter of bolt 10, the said nut may be dropped tliereover without any engagement of the threads of both being effected, and the nut quickly brought to its holding position. To effect engagement of the threads fortlie purpose of bringing the nut into a securing position, it is necessary to center the saine relatively to its bolt. The nut, fortliis purpose, is further counterbored at its inner end to provide an outwardly flaring portion 14, preferably conical to elfect a gradual and easy centering upon an annular centering member or washer l5 which is adapted to be slipped over the bolt 10 and of a contour substantially. similar to that of the inner end o1' the'nut 12. The outwardly flaring portion of the inner diameter of said nut is, furthermore, near the inner face of the nut made cylindrical to assist in the centering and to enable the nut to be screwed down firmly without binding upon member 15.

In Fig, 3, a threaded member 1G such as is employed in recording gages is held by a taper fit upon a rotatable arbor l? of the gage (not shown) and the centering membei l5, of the form illustrated in Fig. l, is made integral with the said threaded meinber 1G. The nut is in the form of a cap 18 with a flange 19 adapted to bear down upon a chart 2O to hold the saine to a similar fiange 2l of the member 16. In thus having the nut to afford an opening larger than ordinarily required and in providing means in proximity to an abutment or object to be held whereby the said nut may be properly centered to effect engagement of its threads with those of the bolt upon which it is fitted, it becomes possible to draw it very quickly and readily against such abutment or object to be held, as it is necessary merely to drop the nut over its bolt until the centering member comes into action and to then give it a partial turn. It is evident, of course, that the construction might be reversed, but it is'preferred to increase the opening in the nut rather than decrease the diameter of the bolt.

l claim 1. Avscrew fastening device including a threaded bolt and a threaded init therefor of larger opening than said bolt, the threads of one of which extend but 'partly around the saine, and means to center said vnut with respect to 'said bolt.

2. A screw fastening device including a li i1) threaded bolt, a partly threaded nut of larger opening than said bolt and adapted to t thereover, and; means to center said nut with respect to said bolt.

3. A `screw fastening device including a .threaded bolt, a nut having an eccentric, threaded opening larger than said bolt and adapted to fit thereover, and means to center said nut with respect to said bolt. l

4l. A screw fastening device including a threaded bolt, a nut having an eccentric, suitably threaded opening larger than said bolt flaring outwardly at the inner end and adapted to fit thereover, and means to center said nut with respect to said bolt.,

5. A screw fastening device including a threaded bolt, a partly threaded nut of larger openingthan'said bolt and adapted to fit thereover, said opening'flaring out-` wardly and at its immediate inner end` be- .ing parallel to the said bolt, and meant; to

center said nut with respect to said bolt.

6. .A screw fastening device including a threaded member provided with a holding flange and of larger diameter immediately above said holding flange and tapering therefrom to its threaded portion,A and a nut whose threads extend but partly around. the same, said nut havingan eccentric opening threaded member provided with a holding flange and of larger diameter immediately above said holding flange and tapering therefrom to lits threaded portion, and a cap having an eccentric interior ,with threads extending but partly `around the same, said interior flaring outwardly at the inner end correspondingly to the` said 'tapered portion vof the threaded member and about which the cap is adapted to be fitted. y

8. A screw fastening device including a threaded member and al second threaded member to itthereon and of larger opening than said first-named member, the threads of one of said/members extending but partly around the same, and means to center said members With respect to each other.

Signed at NewlYork, in the county of New Yorlr,'and State of New York, this 7th day of March, A. D. 19,14.

wmLrAM n. yBnrsron l/Vitnesses FREDKJF. SclerUFfrzs LAURA E. SMITH. 

